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PreprintCC BY 4.0arXiv

Integer-Graded Reciprocal Skin Effect from Internal Rotation

  • Kin Hung Fung
  • C. T. Chan
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Abstract

A prominent class of reciprocal non-Hermitian skin effects has a Z2 topological classification, characterized by a parity invariant protected by reciprocity. We show that conserved internal rotation refines this classification into an unbounded integer-graded hierarchy. Every angular momentum channel is an exactly solvable asymmetric chain with its own integer point-gap winding, while conjugate channels accumulate at opposite edges so that reciprocity is preserved globally. For conserved channels, the classification contains one integer per conjugate pair, with the number of independent integers determined by the internal multiplet. Half-integer spin realizes the symplectic class AII†, whose Z2 index is recovered as the parity of the grading. Conjugate-channel mixing destroys the grading and leaves a critical, scale-free skin effect. A cyclic three-site lattice and a passive array of lossy resonators provide minimal realizations.

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Cite

BibTeXRIS
BibTeX
@misc{fung2026integergraded,
  title = {{Integer-Graded Reciprocal Skin Effect from Internal Rotation}},
  author = {Kin Hung Fung and C. T. Chan},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2608.01520},
  eprint = {2608.01520},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2608.01520},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Integer-Graded Reciprocal Skin Effect from Internal Rotation
AU  - Kin Hung Fung
AU  - C. T. Chan
PY  - 2026
DA  - 2026/10/08
PB  - arXiv
DO  - 10.48550/arxiv.2608.01520
UR  - https://arxiv.org/abs/2608.01520
AB  - A prominent class of reciprocal non-Hermitian skin effects has a Z_2 topological classification, characterized by a parity invariant protected by reciprocity. We show that conserved internal rotation refines this classification into an unbounded integer-graded hierarchy. Every angular momentum channel is an exactly solvable asymmetric chain with its own integer point-gap winding, while conjugate channels accumulate at opposite edges so that reciprocity is preserved globally. For conserved channels, the classification contains one integer per conjugate pair, with the number of independent integers determined by the internal multiplet. Half-integer spin realizes the symplectic class AII^†, whose Z_2 index is recovered as the parity of the grading. Conjugate-channel mixing destroys the grading and leaves a critical, scale-free skin effect. A cyclic three-site lattice and a passive array of lossy resonators provide minimal realizations.
ER  -